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June 16, 2022 <br />143 <br /> <br />(k) Trip Assignments. Assignments must be made considering logical routings, available <br />roadway capacities, left turns at critical intersections and projected (and perceived) <br />minimum travel times. In addition, multiple paths should often be assigned between <br />origins and destinations to achieve realistic estimates rather than assigning all of the trips <br />to the route with the shortest travel time. The assignments must be carried through the <br />external site access points and in large projects (those producing five hundred (500) or <br />more additional peak direction trips to or from the site during the development’s peak <br />hour) through the internal roadways. When the site has more than one access driveway, <br />logical routing and possibly multiple paths should be used to obtain realistic driveway <br />volumes. The assignment should reflect conditions at the time of the analysis. <br />Assignments can be accomplished either manually or with applicable computer models. <br />If a thorough analysis is required to account for pass-by trips, the following procedure <br />should be used: <br />1. Determine the percentage of pass-by trips in the total trips generated <br />2. Estimate a trip distribution for the pass-by trips <br />3. Perform two separate trip assignments, based on the new and pass-by trips <br />4. Combine the pass-by and new trip assignment <br />Upon completion of the initial site traffic assignment, the results should be reviewed to <br />see if the volumes appear logical given characteristics of the road system and trip <br />distribution. Adjustments should be made if the initial results do not appear to be logical <br />or reasonable. <br />(l) Total Traffic Impacts. Traffic estimates for any site with current traffic activity must <br />reflect not only new traffic associated with the site’s redevelopment, but also the trips <br />subtracted from the traffic stream because of the removal of a land use. The traffic <br />impact report should clearly depict the total traffic estimate and its components. <br />(m) Capacity Analysis. Capacity analysis must be performed at each of the major street and <br />project site access intersection locations (signalized and non-signalized) within the study <br />area. In addition, analyses must be completed for roadway segments, deemed sensitive <br />to site traffic within the study area. These may include such segments as weaving <br />sections, ramps, internal site roadways, parking facility access points and reservoirs for <br />vehicles queuing off site and on site. Other locations may be deemed appropriate <br />depending on the situation. <br />The recommended level-of-service analysis procedures detailed in the most recent <br />edition of the Highway Capacity Manual must be followed. The Planning Commission <br />considers the overall level-of-service ratings A, B and C to be acceptable for signalized <br />intersections (Levels B or better are considered desirable); level-of-service D, E or F is <br />considered to be unacceptable. <br />The operational analyses in the Highway Capacity Manual should be used for analyzing <br />existing conditions, traffic impacts, access requirements, or other future conditions for <br />which traffic, geometric and control parameters can be established.